linux-kernel - Re: [PATCH] md: dm-verity: Fix to avoid a deadlock in dm-bufio

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Date:	Mon, 4 Mar 2013 17:42:54 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	Paul Taysom <taysom@...omium.org>
Cc:	agk@...hat.com, dm-devel@...hat.com, neilb@...e.de,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	msb@...omium.org, mpatocka@...hat.com, olofj@...omium.org
Subject: Re: [PATCH] md: dm-verity: Fix to avoid a deadlock in dm-bufio

On Mon, Mar 04, 2013 at 08:45:48AM -0800, Paul Taysom wrote:
> @@ -449,8 +468,14 @@ static void verity_prefetch_io(struct dm_verity *v, struct dm_verity_io *io)
>  				hash_block_end = v->hash_blocks - 1;
>  		}
>  no_prefetch_cluster:
> -		dm_bufio_prefetch(v->bufio, hash_block_start,
> -				  hash_block_end - hash_block_start + 1);
> +		vw = kmalloc(sizeof(*vw), GFP_KERNEL);

kmalloc?  mempool? ...

Alasdair

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